Mark 10:6-12

But when God made the world, ‘he made them male and female.’ ‘So a man will leave his father and mother and be united with his wife, and the two will become one body.’ So there are not two, but one. God has joined the two together, so no one should separate them.” Later, in the house, his followers asked Jesus again about the question of divorce. He answered, “Anyone who divorces his wife and marries another woman is guilty of adultery against her. And the woman who divorces her husband and marries another man is also guilty of adultery.”